Hello my name is ***** ***** I will help you.
For now please let me know what type of tenancy you have?
Thanks. You need to check your tenancy agreement
1) The Council can gain access and you do not have to be present. Imagine if you were working all day it would be impossible to continue working whilst this refurbishment was going on.
2) Yes you can insist on this and indeed they have to clean up. If things are damaged they have to repair/replace them
3) You cant - generally it will be in your tenancy agreement that you must allow the Landlord to carry out this work. If you do not then you could be in breach of your tenancy agreement.
If this happens technically they can serve notice to quit and seek possession of your property.
Check the tenancy agreement, see if it says you can exclude them - I doubt it, but check.
Can I clarify anything for you about this today please?